Track JS allocations as they arrive with no affection on performance when tracking is switched off

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3211 matching lines @@
 
 
 TEST(Regress169928) {
   i::FLAG_allow_natives_syntax = true;
   i::FLAG_crankshaft = false;
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
   v8::HandleScope scope(CcTest::isolate());
 
+  HeapObjectsTracker tracker;
+
   // Some flags turn Scavenge collections into Mark-sweep collections
   // and hence are incompatible with this test case.
   if (FLAG_gc_global || FLAG_stress_compaction) return;
 
   // Prepare the environment
   CompileRun("function fastliteralcase(literal, value) {"
              "    literal[0] = value;"
              "    return literal;"
              "}"
              "function get_standard_literal() {"
              "    var literal = [1, 2, 3];"
              "    return literal;"
              "}"
              "obj = fastliteralcase(get_standard_literal(), 1);"
              "obj = fastliteralcase(get_standard_literal(), 1.5);"
              "obj = fastliteralcase(get_standard_literal(), 2);");
 
   // prepare the heap
   v8::Local<v8::String> mote_code_string =
       v8_str("fastliteralcase(mote, 2.5);");
 
   v8::Local<v8::String> array_name = v8_str("mote");
   v8::Context::GetCurrent()->Global()->Set(array_name, v8::Int32::New(0));
-

[yurys, 2013/09/25 10:41:12]

Revert this.

[Alexandra Mikhaylova, 2013/09/25 14:33:40]

Done.

   // First make sure we flip spaces
   CcTest::heap()->CollectGarbage(NEW_SPACE);
 
   // Allocate the object.
   Handle<FixedArray> array_data = factory->NewFixedArray(2, NOT_TENURED);
   array_data->set(0, Smi::FromInt(1));
   array_data->set(1, Smi::FromInt(2));
 
   AllocateAllButNBytes(CcTest::heap()->new_space(),
                        JSArray::kSize + AllocationMemento::kSize +
@@ skipping 174 matching lines @@
              "    var a = new Array(n);"
              "    for (var i = 0; i < n; i += 100) a[i] = i;"
              "};"
              "f(10 * 1024 * 1024);");
   IncrementalMarking* marking = CcTest::heap()->incremental_marking();
   if (marking->IsStopped()) marking->Start();
   // This big step should be sufficient to mark the whole array.
   marking->Step(100 * MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD);
   ASSERT(marking->IsComplete());
 }